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CONE RESISTANCE AS A MEASURE OF SAND STRENGTH

The writer feels that although his experience has been primarily with the trafficability penetrometer used at shallow depths, the plasticity theory methods that he prefers for the evalaution of soil strength from cone resistance would also be useful for the evaluation of the strength of sand at great depths. Sand strength, as postulated by the authors is based on drained conditions. Zone failure, the subject of plasticity theory, is typical of drained conditions. Solutions of the differential equations of plasticity are obtained in the form of slipline fields, as shown in the case of a 60 degree cone and 30-psf surchange load. One of the advantages of plasticity theory solution is that in addition to the slipline field geometry, the stress states in the soil, compatible with equilibrium in axial symmetry, are also obtained.